On this day: April 25

2011: Forty-six tornadoes break out on what would turn out to be the first day of a record-breaking four-day outbreak of tornadoes across the Southern United States as well as parts of the Midwest and Northeast. By the time the outbreak was over, more than 300 confirmed tornadoes will have killed 325 people, making it the deadliest tornado outbreak in the U.S. since 1936.

The guillotine is first used, American and Soviet troops cut Nazi Germany in two, a U.S. Navy submarine completes the first submerged circumnavigation of the globe, and the Hubble Space Telescope is launched, all on this day.